Pump



L. E. RUSSELL Aug. 5, 1952 PUMP Filed Feb. 25 1950 BMW Patented Aug. 5, 1952 PUMP Linus E. Russell, Springfield, Ohio, assignor to Peters & Russell, Inc., Springfield, Ohio, a corporation of Ohio Application February 25, 1950, Serial No. 146,296

This invention relates to reciprocating pumps and more particularly to stirrup pumps of general utility such as carried in automobiles for emergency tire pumping.

It is a paramount objective of designers in this art to reduce the cost of manufacture of the pumps, and hence their selling price, while retaining reliability of performance and the ability to withstand rough handling and use. Additionally it is a necessary objective to successfully supply two diverse markets. With one class of purchaser, price is the most important factor and a cheap construction is essential. With another class of purchaser a greater cost is possible but added features of advantage must be incorporated in the pump, for example, folding stirrups for easy storage. It is, of course, desirable in the interests of simplified, inexpensive manufacture that both types of pumps have the same basic construction.

The instant invention achieves the noted design objectives in a better and more efiicient manner than has heretofore been known, and to do so is the general object of the invention.

Thus the object of the invention is to simplify the construction as well as the means and mode of assembly of reciprocating pumps as disclosed herein whereby such pumps may not only be economically manufactured, but will be more efficient and satisfactory in use, adaptable to many uses, having relatively few parts and be unlikely to get out of repair.

A further object of the invention is to obviate the use of cast metal parts in the pump, it being contemplated that the cast parts heretofore used shall be replaced by inexpensive metal stampings.

Another object of the invention is to introduce a new mode of sealing of the bottom of the pump cylinder involving use of a resilient, deformable plug.

A further object of the invention is to utilize the resilient plug for the mounting of pump elements and accessories such as the hose fitting or stirrup loops or both.

Still another object of the invention'is to make a general revision of the base construction of a pump with the view of reducing the cost thereof while retaining effective sealing and providing for simplified installation of base accessory elements.

A further object of the invention is to provide a pump possessing the advantageous structural features, the inherent meritorious characteristics and the mode of operation herein mentioned.

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, as hereinafter described or illustrated in the accompanying drawings, or their equivalents.

' 11 Claims. (01. 230-235) Referring to the accompanying drawing, wherein is found the preferred but obviously not neces-' sarily the only embodiment of the invention;

Fig. l is a view in side elevation of a rigid base type pump in accordance with the instant invention; g

Fig. 2 is a top plan view of the pump of Fig. 1';

Fig. 3 is a detail view of the handle end of the pump of Fig. 1;

Fig. 4 is a detail view in longitudinal section of the base end of the pump of Fig. 1;

Fig. 5 is a view similar to Fig. 4 showing a folding stirrup type pump; I

Fig. 6 is a view similar to'Fig. 5 but in elevation and showing one of the stirrup loops in perspective, partly disengaged; and

Fig. 7 is a fragmentary View of a further modification in the base assemblyembodying the same inventive concept as shown in the preceedin views.

Like parts are indicated bysimilar characters of reference throughout the several views.

Referring to the drawing, a pump in accordance with the first illustrated form of the invention (Figs. 1 to 4) may comprise an elongated cylinder l0 mounted on a base member I l in perpendicular relation thereto. The upper end of the cylinder i0 is closed by a cap l2 providing a loose bearing for a rod I3 having one end terminating within the cylinder. and the other end extending outside the cylinder through and .above the cap l2. Within the cylinder the rod l3 has fixed thereto a piston (not shown) conventionally arranged to allow air to fiow past it to the bottom of the cylinder but to prevent flow in the opposite direction. Outside the cylinder the rod has a handle I4 connected thereto;

The handle M consists of a relatively short length of strip material formed into substantially a cylindrical member the center of which is pierced to receive the rod l3.

The lower end of the cylinder I0 is sealed, in a manner to be described, and mounts a laterally projecting fitting I5 to which is connected a flexible hose l 6 for attachment to a tire or other place of compressed air discharge. According to the operation of the pump, air is drawn into the cylinder through the loose bearing provided by cap I 2. Such air flows past the piston on rod [3, and upon the downward or compression stroke of rod I3 is forced out through fitting l5 and hose [6. Reciprocation of the rod l3 in this manner will deliver successive charges of compressed air through the hose IB, as is well known. It will be understood that the system will ordinarily require a check valve to avoid return flow through the hose [6, and such a valve may be incorporated in the fitting l5, this being an element supplied either with or without a check. valve.

Turning now to a more particular consideration of the base construction of the pump, the

base member I I is made of asimple sheet metal stamping with a downturned peripheral edge. The upper surface of the member II is flat although there may be strengthening ribs formed therein, as a bead I1. The cylinder IIl occupies a central position upon member II and its open lower end is flared outward and connected to the base member, as by spot welding. In effecting such connection there is no requirement of sealing so that it may be accomplished in any convenient and inexpensive manner.

A sealing closure for the lower end of the cylinder is defined by a plug I8 of resilient, deformable material such as soft rubber or rubber substitute. The initial diameter of the plug I8 is somewhat greater than the internal diameter of the cylinder 18 so that its installation is accomplished as a press fit, with the material of the plug exerting an expansive, sealing pressure against the wall of .the cylinder. In inserting the plug I8 into the cylinder its outer end is allowed to coincide with or to project slightly below the horizontal plane of the flared end of the cylinder. Accordingly, in mounting and fastening the cylinder to the base member II there is an axial compression of the material of the plug, causing it to flow or expand into an annular crevice I9 defined by the flared end of the cylinder and the fiat surface of the base member II. Effective sealing at the point of attachment of the cylinder to the base thereby is accomplished, as well as a positive lock against axial displacement of the plug I8.

The plug I8 is formed during the molding thereof, with a central recess 2| in its inner end. Communicating with the recess 2I, and extending radially through the plug I8, is an opening 22 registering with an opening 23 in the wall of cylinder Ill. The openings 22 and 23 are arranged to receive a hollow tubular stem 2 which is a part of the fitting I5. The stem 24 thus connects the interior of the cylinder III to the fitting I which is in turn connected to hose I8 by a 'circumferentially serrated projection 25.

At its inner end the stem 24 is formed with an enlarged tapered head 26 which upon entering recess 2| resists withdrawal of the stem. The opening 22 in the plug I8 has an initial diameter smaller than the head 26 and smaller than the shank of stem '24, while opening 23 is of a size to pass the head 26. In inserting the stem 24, therefore, the head 28 deforms or expands the opening 22, with the material of the plug springing back after passage of the head to grip the stem in pressure sealing engagement. 'Tihe escape of air around the stem accordingly is precluded and there is further provided a resilient yet firm mount for the fitting IS.

A convenient manner of constructing andas" sembling the base is topreform the cylinder I3 with its flared end and with the opening 23. The plug I8, without the perforation or opening 22 then is inserted in the flared end of the cylinder and the cylinder mounted on and attached to base member II. With the parts so arranged, opening 23 presents a means of access to plug I8 through which perforation or opening 22 is drilled or punched, thus obviating the need for aligning a preformed opening 22 with the opening 23. After formation of the opening 22, the fitting I5 is installed by pressing the stem 24 into place in the manner described.

The plug I8 provides a convenient mount for pump elements and accessories, as further illustrated in Figs. 5 and 6. In these views an em.

bodiment of the invention is contemplated which is the same as that above described except that foldable stirrup means replaces the rigid base member II as a foot rest for anchoring the pump during its operation. In this instance a cylinder 21 has a flared end receiving a resilient, deformable sealing plug 28, as in the preceding embodiment, with the plug and cylinder mounting a fitting, corresponding to the fitting I5, of which only the head 29 here appears. Further in accordance with this embodiment, however, the base of the pump is represented by a small diameter disc-shaped member 3I and by a pair of wire stirrup loops 32 having a pivotal mounting in the side of the cylinder 21 and in the plug 28. The base member 3I functions essentially as a closure cap for the lower end of the cylinder 21, its peripheral edge being crimped up and over the fiared end of the cylinder. An internal annular crevice 33 is so formed, corresponding to the crevice I9 of Fig. 4, which is filled by expanding material from the plug 28. If desired, spot welds may be used for a secure connection between the base member 3| and the cylinder 21.

The stirrup loops 32 have free inturned ends 34 received in lateral sets of recesses 35 and 36 and offset from the longitudinal axis of the plug on opposite sides thereof. The ends 34 can be sprung apart for purposes of assembly and disassembly and gain access to the plug 28 through suitable drilled holes 31 in the cylinder 21. If desired, the holes 31 and. the recesses 35 and 36 can be drilled simultaneously, after the plug 28 has been installed in the cylinder. It will be understood, however, that as in the case of stem 29 it is desirable to obtain a resilient clamping action of the material of the plug 28 upon the stirrup ends 34 in order that the stirrup loops may be yieldingly held in a folded upright position when the pump is not in use. Thus, the holes 31 and the recesses 35 and 38 will be drilled separately if necessary to secure such action.

In Fig. 7 is shown a further modification of the base assembly similar to that shown in Fig. 4, but eliminating the necessity for the weldin of the cylinder III to the base II. This assembly differs from Fig. 4 in the fact that a supplemental base member 38 is placed over the base II in enclosing relation therewith, the bottom edge of the supplemental member 38 being crimped or folded over the flange of base II as shown at 39.

The supplemental base 38 is centrally perforated to receive therethrough the cylinder III, the peripheral edge 40 of the perforation overlying the outwardly flared end of the cylinder. The cylinder is thereby firmly secured in position with the plug I8 deformed into sealing contact with the cylinder III and base II under compression influence created by the overlying supplemental base member 38.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificin any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise but one of several modes of putting the invention into eifect.

Having thus described my invention, I claim:

1. A pump base construction, including a base member presenting a flat upper surface, a cylinder having one end resting on and connected to said base member, a rubber or rubber-like plug pressed into said end of the cylinder filling and closing said end of the cylinder and seated on said base member to seal the connection between said member and said cylinder, a radial opening in said cylinder, a passage through said plug to communicate said opening with the interior of said cylinder, and a hose connector outside said cylinder and having a stem extending laterally through said opening and into said passage.

2. A pump base construction, including a base der registering with the radial passage in said plug, and a hose connector outside said cylinder and having a stem extending through said opening and through said passage into the recess in said plug, said passage being smaller in diameter than said stem to provide for a press fit of said stem in said passage with the material of said plug closing in sealing contact upon said stem.

3. A pump base construction, including a base member presenting a flat upper surface, a cylinder having an outwardly flared end resting on the upper surface of said base, a plug of resilient deformable material having a press fit in said end of the cylinder filling and closing said end of the cylinder and expanding out onto the flared portion thereof, a recess in the inner end of said plug, means for connecting the flared end of said cylinder to said base member, and a hose connector outside said cylinder comprising a stem portion inserted radially through said cylinder and said plug into said recess.

4. A pump base construction according to claim 3, characterized in that said stem is received in a radial opening in said plug which is expanded by insertion of the stem with the material of the plug closing upon the stem to define both a seal and a mount for the hose connector.

5. A pump base construction, including a stamped metal base member presenting a flat upper surface, a cylinder having an outwardly flared end resting on the upper surface of said base member, there being an internal, annular crevice defined at the juncture of said flared end and flat base surface, means for connecting the flared end of said cylinder to said base member, a plug of resilient deformable material having a press fit in said end of the cylinder and expanding into said annular crevice, a recess in the inner end of said plug, a radial opening in the plug extending from the periphery thereof into said recess, and a hose connector outside the cylinder having a stem inserted through said radial opening to communicate with said recess, said stem having a press fit in said opening for sealing contact of the material of the plug therewith and for a mounting of said connector, said cylinder presenting a radial hole for admission of said stem to the interior thereof.

6. A pump base construction according to claim 5, characterized in that said stem has a tapered head which when received in said recess inhibits withdrawal of the stem, the hole in said cylinder being of a size to pass said head and the opening in said plug being of a size to pass said head only by a deforming of the material of the plug.

7 7. A pump base construction, including a base member, a cylinder open at its bottom and mounted on said base member in perpendicular relation thereto, a plug of resilient deformable material having a press fit in the open bottom of said cylinder closing and sealing said bottom, means for connecting said cylinder to said base, and one or more lateral openings in said cylinder for the insertion of pump elements to be mounted in said plug.

8. A pump base construction, including a base member, a cylinder open at its bottom and mounted on said base member in perpendicular relation thereto, means for connecting said cylinder to said base, and a plug of resilient deformable material having a press fit in the open bottom of said cylinder and held in place by said base, said plug closing and sealing the bottom of said cylinder and providing a mount for pump elements introduced laterally through said cylin-' der.

9. A pump base construction, including a base member, a cylinder open at its bottom and mounted on said base member in perpendicular relation thereto, means for connecting said cylinder to said base, a plug of resilient deformable material having a press fit in the open bottom of said cylinder and held in place by said base member to close and seal the bottom of said cylinder, and stirrup means having a pivotal mounting through said cylinder in said plug to be moved alternatively to a folded position alongside the cylinder and to an outstretched position for operation of the pump.

10. A pump base construction, including a base member, a cylinder having a flared end seated on said base member, said flared end of the cylinder and base member being interconnected to form a unitary structure, an internal annular crevice formed intermediate the base member and said flared cylinder end, and a plug of resilient deformable sealing material positioned within the flared end of said cylinder to close the said end of the cylinder and expanding into said annular crevice under contact pressure of said base member.

11. A pump base construction according to claim 10, characterized by foldable stirrup means mounted in laterally drilled holes in said cylinder and said plug.

LINUS E. RUSSELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 559,957 Stoddard May 12, 1896 686,939 Horn Nov. 19, 1901 2,326,568 Rose Aug. 10, 1943 2,365,673 Benson Dec. 26, 1944 

